added bittorrent support(experimental)

test/DefaultDiskWriterTest.cc

@@ -0,0 +1,35 @@
+#include "DefaultDiskWriter.h"
+#include <string>
+#include <cppunit/extensions/HelperMacros.h>
+
+using namespace std;
+
+class DefaultDiskWriterTest:public CppUnit::TestFixture {
+
+  CPPUNIT_TEST_SUITE(DefaultDiskWriterTest);
+  CPPUNIT_TEST(testSha1Sum);
+  CPPUNIT_TEST_SUITE_END();
+private:
+
+public:
+  void setUp() {
+  }
+
+  void testSha1Sum();
+};
+
+
+CPPUNIT_TEST_SUITE_REGISTRATION( DefaultDiskWriterTest );
+
+void DefaultDiskWriterTest::testSha1Sum() {
+  DefaultDiskWriter dw;
+  dw.openExistingFile("4096chunk.txt");
+  
+  CPPUNIT_ASSERT_EQUAL(string("608cabc0f2fa18c260cafd974516865c772363d5"),
+		       dw.sha1Sum(0, 4096));
+
+  CPPUNIT_ASSERT_EQUAL(string("7a4a9ae537ebbbb826b1060e704490ad0f365ead"),
+		       dw.sha1Sum(5, 100));
+
+  dw.closeFile();
+}